Please help to find payment processor

Hello, everyone!
We are a service that provides its customers with phone numbers for receiving messages from various services, social networks, instant messengers and other categories of sites.

We're looking for a payment processor, most likely high-risk, according to answers from payment processors we've applied, but they rejected us. What we're looking for is card payments processing, we have a big amount of small transactions, since our services does not cost much and average price is...

Please help to find payment processor